gcc/tree-ssanames.h

   1 /* SSA name expresssons routines
   2    Copyright (C) 2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_TREE_SSANAMES_H
  21 #define GCC_TREE_SSANAMES_H
  22
  23 /* Aliasing information for SSA_NAMEs representing pointer variables.  */
  24
  25 struct GTY(()) ptr_info_def
  26 {
  27   /* The points-to solution.  */
  28   struct pt_solution pt;
  29
  30   /* Alignment and misalignment of the pointer in bytes.  Together
  31      align and misalign specify low known bits of the pointer.
  32      ptr & (align - 1) == misalign.  */
  33
  34   /* When known, this is the power-of-two byte alignment of the object this
  35      pointer points into.  This is usually DECL_ALIGN_UNIT for decls and
  36      MALLOC_ABI_ALIGNMENT for allocated storage.  When the alignment is not
  37      known, it is zero.  Do not access directly but use functions
  38      get_ptr_info_alignment, set_ptr_info_alignment,
  39      mark_ptr_info_alignment_unknown and similar.  */
  40   unsigned int align;
  41
  42   /* When alignment is known, the byte offset this pointer differs from the
  43      above alignment.  Access only through the same helper functions as align
  44      above.  */
  45   unsigned int misalign;
  46 };
  47
  48 /* Value range information for SSA_NAMEs representing non-pointer variables.  */
  49
  50 struct GTY (()) range_info_def {
  51   /* Minimum for value range.  */
  52   double_int min;
  53   /* Maximum for value range.  */
  54   double_int max;
  55   /* Non-zero bits - bits not set are guaranteed to be always zero.  */
  56   double_int nonzero_bits;
  57 };
  58
  59
  60 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
  61 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
  62 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
  63
  64 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
  65 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
  66
  67
  68 /* Type of value ranges.  See value_range_d In tree-vrp.c for a
  69    description of these types.  */
  70 enum value_range_type { VR_UNDEFINED, VR_RANGE, VR_ANTI_RANGE, VR_VARYING };
  71
  72 /* Sets the value range to SSA.  */
  73 extern void set_range_info (tree, double_int, double_int);
  74 /* Gets the value range from SSA.  */
  75 extern enum value_range_type get_range_info (const_tree, double_int *,
  76                                              double_int *);
  77 extern void set_nonzero_bits (tree, double_int);
  78 extern double_int get_nonzero_bits (const_tree);
  79 extern void init_ssanames (struct function *, int);
  80 extern void fini_ssanames (void);
  81 extern void ssanames_print_statistics (void);
  82 extern tree make_ssa_name_fn (struct function *, tree, gimple);
  83 extern void release_ssa_name (tree);
  84 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
  85                                     unsigned int *);
  86 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
  87 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
  88                                     unsigned int);
  89 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
  90                                           unsigned int);
  91 extern struct ptr_info_def *get_ptr_info (tree);
  92
  93 extern tree copy_ssa_name_fn (struct function *, tree, gimple);
  94 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
  95 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple);
  96 extern void duplicate_ssa_name_range_info (tree, struct range_info_def *);
  97 extern void release_defs (gimple);
  98 extern void replace_ssa_name_symbol (tree, tree);
  99
 100
 101 /* Return an SSA_NAME node for variable VAR defined in statement STMT
 102    in function cfun.  */
 103
 104 static inline tree
 105 make_ssa_name (tree var, gimple stmt)
 106 {
 107   return make_ssa_name_fn (cfun, var, stmt);
 108 }
 109
 110 /* Return an SSA_NAME node using the template SSA name NAME defined in
 111    statement STMT in function cfun.  */
 112
 113 static inline tree
 114 copy_ssa_name (tree var, gimple stmt)
 115 {
 116   return copy_ssa_name_fn (cfun, var, stmt);
 117 }
 118
 119 /*  Creates a duplicate of a SSA name NAME tobe defined by statement STMT
 120     in function cfun.  */
 121
 122 static inline tree
 123 duplicate_ssa_name (tree var, gimple stmt)
 124 {
 125   return duplicate_ssa_name_fn (cfun, var, stmt);
 126 }
 127
 128 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
 129    in function cfun.  Arrange so that it uses NAME in dumps.  */
 130
 131 static inline tree
 132 make_temp_ssa_name (tree type, gimple stmt, const char *name)
 133 {
 134   tree ssa_name;
 135   gcc_checking_assert (TYPE_P (type));
 136   ssa_name = make_ssa_name_fn (cfun, type, stmt);
 137   SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
 138   return ssa_name;
 139 }
 140
 141
 142 #endif /* GCC_TREE_SSANAMES_H */